Add sandbox support for Windows process mitigations

sandbox/win/src/dep.h

Index: sandbox/win/src/dep.h
===================================================================
--- sandbox/win/src/dep.h	(revision 156579)
+++ sandbox/win/src/dep.h	(working copy)
@@ -1,25 +0,0 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef SANDBOX_SRC_DEP_H__
-#define SANDBOX_SRC_DEP_H__
-
-namespace sandbox {
-
-enum DepEnforcement {
-  // DEP is completely disabled.
-  DEP_DISABLED,
-  // DEP is permanently enforced.
-  DEP_ENABLED,
-  // DEP with support for ATL7 thunking is permanently enforced.
-  DEP_ENABLED_ATL7_COMPAT,
-};
-
-// Change the Data Execution Prevention (DEP) status for the current process.
-// Once enabled, it cannot be disabled.
-bool SetCurrentProcessDEP(DepEnforcement enforcement);
-
-}  // namespace sandbox
-
-#endif  // SANDBOX_SRC_DEP_H__